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R438A (MO99) Refrigerant 25 LB

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We provide high-performance refrigerants for air conditioning, refrigeration, and industrial cooling. Fast shipping, top quality, and trusted service—stay cool with AeroRefrigerant!

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R-438A Refrigerant | Arctic Prince

25 LB Professional Grade

🌍

Zero ODP Solution

HFC refrigerant with zero ozone depletion potential, perfect for environmentally conscious operations.

🔄

System Upgrade Solution

Specifically designed for upgrading older HCFC systems with direct expansion evaporators.

⚙️

Wide Compatibility

Works with positive displacement compressors and various refrigeration and AC systems.

Best Value

SINGLE CYLINDER

$170.00

• 25 LB Cylinder
• Professional Grade
• Free Shipping
• Factory Sealed
• EPA Certified
• Same-Day Shipping

A single 25 lb cylinder of R-438A, sold as Genetron MO99. It is engineered to come closer to R-22’s overall behaviour across direct expansion systems than most alternatives while still working with existing mineral oil. One cylinder is enough for a standard conversion including the line set.

R-438A — Common Questions

Compatibility, lubricant and handling questions technicians ask about R-438A

How close is R-438A to R-22?

It is engineered to come closer to R-22’s overall behaviour across direct expansion systems than most alternatives, while still working with the existing mineral oil. That combination is the reason it gets specified on jobs where the customer would notice a drop in performance.

Is MO99 the same as R-438A?

Yes. Genetron MO99 is Honeywell’s trade name for R-438A.

Does R-438A require changing the oil or components?

It is formulated for use with the existing mineral oil, and the metering device usually does not need replacing. Fit a new filter drier as part of the conversion. Take baseline readings first so you can verify the result — see the retrofit sequence.

Does R-438A have glide?

Yes, as all the R-22 replacement blends do. Liquid charging only, and remember the evaporator temperature is not one number — read superheat against the correct end of the glide or the charge will look right when it is not. Compare it with the alternatives in our drop-in comparison.

Shipping and returns

Shipping is free on every order. Transit time depends on your location and the size of the order — a single cylinder ships as a parcel, while quarter, half and full pallets move by freight and take longer to arrive. Returns are free.

Customer Reviews

4.8

★★★★★

Based on 521 verified reviews

✓ USA Customers

★ 100% Satisfaction

★★★★★

(480)

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(31)

★★★★★

(6)

★★★★★

(3)

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(1)

★★★★★

Daniel Whitfield Verified

Texas, USA

March 2, 2025

Ordered R-410A and it landed two days later, sealed and exactly as listed. My HVAC unit is running great and the price beat every other quote I got. New go-to supplier.

★★★★★

Carmen Ruiz Verified

Florida, USA

February 24, 2025

Grabbed R-404A for a walk-in cooler job. Fast shipping, tight packaging, and the cylinder was factory-sealed. Quality and price both spot on — ordering again.

★★★★★

Andre Coleman Verified

California, USA

February 19, 2025

R-22 came authentic and well boxed, right on schedule. Got the AC back up the same afternoon. Smooth order from cart to delivery — couldn’t ask for more.

★★★★★

Priya Raman Verified

New York, USA

February 15, 2025

Very happy with my R-407C order. Arrived quick, packed securely, and matched the description exactly. Pricing was better than the local supply house. Will reorder.

★★★★★

Wesley Tan Verified

Arizona, USA

February 11, 2025

Picked up R-134A for an auto AC repair. Shipped fast, sealed tight, and worked perfectly. Fair price and the support team actually answered my questions. Recommend.

★★★★★

Bianca Foster Verified

Nevada, USA

February 7, 2025

R-32 blew past my expectations — quick delivery, solid packaging, and flawless performance in my mini-split. Great pricing too. I’ll be back for more.

★★★★★

Marcus Devlin Verified

Illinois, USA

February 3, 2025

Placed a full-pallet order of R-427A. Everything showed up on time and in perfect shape. Bulk pricing is excellent and the service was first-class start to finish.

★★★★★

Helena Brooks Verified

Washington, USA

January 29, 2025

Ordered a mix of cylinders for the shop and the whole thing went smoothly. On time, sealed, top quality, and the bulk rate saved us real money. Highly recommend.

★★★★★

Owen Pearce Verified

Oregon, USA

January 25, 2025

Ten cylinders of R-454B arrived exactly as described, on time and well protected. Quality and price are hard to beat — definitely reordering for the next job.

Reviews4.9

Total: 2,394

5 stars

91%

4 stars

3 stars

2 stars

1 star

Mark Chistian

8 reviews · LA

11 days ago

These guys are very honest and helpful

These guys are very honest and helpful These guys are very honest and helpful. They are very trustworthy and fast shipping. Only company online that I would buy from.

Verified purchase

Jack Lee

2 reviews · NV

2 days ago

R-22 Freon....Great Deal

R-22 Freon was the real thing. My techs say I got a great deal and it worked perfectly on a repair they did to one of my units. Though it seemed like a sketchy website, they shipped it quickly and well packaged. i will use Aero Refrigerant again for my techs needs.

Stephane

1 review · NY

3 days ago

Great product

Great product. Works as described. Wish the delivery was faster. Definitely buy again when needed.Thanks!

Thomas Twing

9 reviews · TX

5 days ago

In a sea of scams this website is legit…

In a sea of scams this website is legit for your freon needs... I only paid about half for their R22 as I would have on those accredited wholesaler websites. I researched for weeks and then finally pulled the trigger. I’m glad I did as their R22 is the real deal and worked out great for my immediate need. Once my order was placed, I got an email with a link tracking my shipment. It only took 3 business days for my pig of R22 to arrive at my door. Will purchase from again.

Elena Garcia

6 reviews · NY

9 days ago

So far the price was very good

So far the price was very good. The delivery was on time.

Jason Davis

4 reviews · IL

Good quality product

Solid refrigerant, good quality. Delivery was on time and packaging was secure. Minor issue was a missing invoice but customer service sorted it quickly.

Olivia Taylor

16 reviews · MI

10 days ago

Fast and easy business to work with

Fast and easy business to work with. Prices are low and delivery is fast.

Jason Martinez

6 reviews · TX

Great customer service

Great customer service. Quick response to issues.

Robert E Decker JR

1 review · PA

This company is outstanding

This company is outstanding! I received my order earlier than expected. Due to a mistake I made, they were still so understanding and helped me come to a solution. I would recommend Aero Refrigerant 100%

Lisa M

3 reviews · MN

Delightful!

The order was easy to place and the representative was very kind and helpful. It arrived quicker than predicted and the valve worked! I had ordered from another company and the valve was faulty. So frustrating!! Thank you - my house is cool and I appreciate it so much!

Vinny Romero

2 reviews · OR

20 days ago

It was exactly what he said it was…

It was exactly what he said it was delivered on time no damage excellent service.

Andrea Polk

12 reviews · TX

Very easy to use website and delivery on time

I was a little skeptical, but they're legit. I received the tank as stated. I would order from them again.

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About AEROREFRIGERANT

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38917 FM 1774, Magnolia, TX 77355, USA

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R438A (MO99) Refrigerant 25 LB

Free Shipping

Free Returns

Secure Shopping

24/7 Support

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R-438A Refrigerant | Arctic Prince

Zero ODP Solution

System Upgrade Solution

Wide Compatibility

SINGLE CYLINDER

R-438A — Common Questions

Customer Reviews

Daniel Whitfield Verified

Carmen Ruiz Verified

Andre Coleman Verified

Priya Raman Verified

Wesley Tan Verified

Bianca Foster Verified

Marcus Devlin Verified

Helena Brooks Verified

Owen Pearce Verified

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